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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.example.android.apis.view;
     18 
     19 import com.example.android.apis.R;
     20 
     21 import android.app.Activity;
     22 import android.os.Bundle;
     23 import android.view.DragEvent;
     24 import android.view.View;
     25 import android.widget.TextView;
     26 
     27 public class DragAndDropDemo extends Activity {
     28     TextView mResultText;
     29     DraggableDot mHiddenDot;
     30 
     31     @Override
     32     protected void onCreate(Bundle savedInstanceState) {
     33         super.onCreate(savedInstanceState);
     34         setContentView(R.layout.drag_layout);
     35 
     36         TextView text = (TextView) findViewById(R.id.drag_text);
     37         DraggableDot dot = (DraggableDot) findViewById(R.id.drag_dot_1);
     38         dot.setReportView(text);
     39         dot = (DraggableDot) findViewById(R.id.drag_dot_2);
     40         dot.setReportView(text);
     41         dot = (DraggableDot) findViewById(R.id.drag_dot_3);
     42         dot.setReportView(text);
     43 
     44         mHiddenDot = (DraggableDot) findViewById(R.id.drag_dot_hidden);
     45         mHiddenDot.setReportView(text);
     46 
     47         mResultText = (TextView) findViewById(R.id.drag_result_text);
     48         mResultText.setOnDragListener(new View.OnDragListener() {
     49             public boolean onDrag(View v, DragEvent event) {
     50                 final int action = event.getAction();
     51                 switch (action) {
     52                     case DragEvent.ACTION_DRAG_STARTED: {
     53                         // Bring up a fourth draggable dot on the fly. Note that it
     54                         // is properly notified about the ongoing drag, and lights up
     55                         // to indicate that it can handle the current content.
     56                         mHiddenDot.setVisibility(View.VISIBLE);
     57                     } break;
     58 
     59                     case DragEvent.ACTION_DRAG_ENDED: {
     60                         // Hide the surprise again
     61                         mHiddenDot.setVisibility(View.INVISIBLE);
     62 
     63                         // Report the drop/no-drop result to the user
     64                         final boolean dropped = event.getResult();
     65                         mResultText.setText(dropped ? "Dropped!" : "No drop");
     66                     } break;
     67                 }
     68                 return false;
     69             }
     70         });
     71     }
     72 }